Detecting abandoned processess in Kafka Streams 2.0 - apache-kafka

Question

I have this case: users collect orders as order lines. I implemented this with Kafka topic containing events with order changes, they are merged, stored in local key-value store and broadcasted as second topic with order versions.
I need to somehow react to abandoned orders - ones that were started but there was no change for at least last x hours.
Simple solution could be to scan local storage every y minutes and post event of order status change to Abandoned. It seems I cannot access store not from processor... But it is also not very elegant coding. Any suggestions are welcome.
--edit
I cannot just add puctuation to merge/validation transformer, because its output is different and should be routed elsewhere, like on this image (single kafka streams app):
so "abandoned orders processor/transformer" will be a no-op for its input (the only trigger here is time). Another thing is that i such case (as on image) my transformer gets ForwardingDisabledProcessorContext upon initialization so I cannot emit any messages in punctuator. I could just pass there kafkaTemplate bean and just produce new messages, but then whole processor/transformer is just empty shell only to access local store...
this is snippet of code I used:
public class AbandonedOrdersTransformer implements ValueTransformer<OrderEvent, OrderEvent> {
#Override
public void init(ProcessorContext processorContext) {
this.context = processorContext;
stateStore = (KeyValueStore)processorContext.getStateStore(KafkaConfig.OPENED_ORDERS_STORE);
//main scheduler
this.context.schedule(TimeUnit.MINUTES.toMillis(5), PunctuationType.WALL_CLOCK_TIME, (timestamp) -> {
KeyValueIterator<String, Order> iter = this.stateStore.all();
while (iter.hasNext()) {
KeyValue<String, Order> entry = iter.next();
if(OrderStatuses.NEW.equals(entry.value.getStatus()) &&
(timestamp - entry.value.getLastChanged().getTime()) > TimeUnit.HOURS.toMillis(4)) {
//SEND ABANDON EVENT "event"
context.forward(entry.key, event);
}
}
iter.close();
context.commit();
});
}
#Override
public OrderEvent transform(OrderEvent orderEvent) {
//do nothing
return null;
}
#Override
public void close() {
//do nothing
}
}